Read through the link in one of above threads , code of practise for in service inspection and testing of electrical equipment
It would involve disconnecting in spur say and test with adapter to you pat test machine , that way it gets stored with all your other equipments information if you have an advanced pat tester
Or old school , ins res test and earth cont , visual , but keep records of tests , model test sheets are in the book
Basically a real ball ache , something we are avoiding , keeps you in work I suppose